ESPN NFL Analyst Ryan Clark Could Have Tragically Died From a 2007 Game Against the Broncos
Pittsburgh Steelers safety Ryan Clark will sit out season opener in Denver due to health risks of playing at high altitude – New York Daily News
Steelers safety quiet as playing is unlikely – The Denver Post
Steelers' Defense, Slowed by Injuries, Still Ranks at the Top - The New York Times
Student Athletes with Sickle Cell Trait Should Take Precautions When Training
2012 NFL playoffs -- Pittsburgh Steelers' Mike Tomlin says Ryan Clark won't play vs. Denver Broncos - ESPN
The Doctor Is In: Is Sickle Cell Trait Too Dangerous In Denver? - Steelers Depot
Flashback Friday: Steelers Pull Away In Second Half For Convincing MNF Win Over Broncos In 2009 - Steelers Depot
Source close to John Brown says sickle cell trait won't keep him out of Denver, doctor weighs in
ESPN's Ryan Clark praised for 'empathy and humanity' in coverage of Damar Hamlin collapse
ESPN Signs NFL Studio Analyst Ryan Clark to Multi-Year Extension - ESPN Press Room U.S.
Bengals vs. Texans: Andy Dalton misses practice; T.J. Yates on track to start - The Washington Post
Clark goes to bat for sickle cell